Fluid speed-regulator for elevators



UNITED STATES vPATENT EEICE.

AWllililAM E. NICKERSON, OF CAMBRDGE, MASSACHUSETTS.

FLUID SPEED-REGULATOR FOR ELEVTORS.

SPECIFICATION forming part of Letters Patent No, 396,889, dated January29, 1889. Application filed September 27, 1888. Serial No. 286,621. (Nomodel.)

To all rui/,0m it 71mg/ concern:

3e it known that I, WILLIAM E. NICKER- SON, of (lamhridgein the countyof Middlesex and State ot Massachusetts, have in- 'vented a new anduseful improvement in Fluid Speed-Regiilators `for Elevators, dac., ofwhich the following, taken in connection with the accompanying drawings,is a specification.

The object ot' my invention .is to adapt a double-acting valve toprevent the tiow of a current of fluid from one side of a pistou ofa'speed-regulator to the other whenever the velocity of said current, asengendered hy the speed of the piston, such as would arise from adangerous rate of speed ot the mechanism the velocity ot which it isdesirable to regulate. 'lhisobjectlattaiu by the mechanism shown in theaccompanying drawings, in which- Figure l is a plan showing one side ofa piston with my valve device attached. Fig 2 is a vertical sectionshowing the position and shape of the valve-openings aud the valves.liig. 2% is a horizontal section taken on line fe ai ol,E lfig. 2.

'lo illustrate my invention l have chosen 'the device as applied toapiston,although the douldeacting valve would work with equal eiiiciencyin a passage in or about the walls ot' the cylinder, the sole object ofthe valve and its connected parts being to regulate the speed ot' themechanism to which it is applied h v checking the iiow ot a fiuid thecurrent in which is engendered by the moving piston.

In the drawings, A represents a piston-rod, to which the piston .l issecured. \Vithin this pistou '12,'1 torni recesses, one on each side ot'thc piston, as indical. fd hy C C', Figs. l and 2. letwt-ien therecesses l have valveopenings D l) D? D, lor the purpose of receivingthe va-lves V Y.

The valves V Y are made with two disks, el (l, which have hetween them awinged conneeting-har, said bar having three wings, \V YV VZ. (See'higs.l, 2, and These valves are double-acting-that is, each has twovalvedisks, one at each end, as indicated by cl (iV- and have two seats,one atl) D and one at D2 D, Fi 2, and the connecting-bar is so formedthat its wings l W' WV2 forni guides for keeping the valve-disks d and din their normal axial position, their normal longitudinal position beingdeterlnined hy springs S, Figs. l and lhe springs S are made,preferably, ot' fiat plates oi' metal and are made fast to the piston Bby screws 'l T, liig. l, the ltree ends of the springs being attached tothe valves by screws and washers, as indicated by Il, Fig. 2. As eachvalve has two springs, one at each end, and oi' about equal tension, itis obvious that the valve when not acted upon by eX- traneous force willstand as indicated by the drawings, Fig. -that is so that Huid may passthrough in either direction; but if a rapid current is generated, aSwould occur when the piston is being driven rapidly, then the pressuregenerated by the high velocity of the piston would cause. the 'valve tomove in the direction ot' the current and close the passage in thepiston, and thus prevent it troni moving so rapidly-iu other words,regulate its velocity ot' motion and, acting through its connectiondevices, would in a like degree checlc the velocity ot the attachedmechanisni. n

It is obvious that instead ol' a valve made with two working ends, as Ihave described, two valves may he used, or a sin gle'valve having twoseats.

A part only oi the cylinder T is shown in Fig. i3, as it is not deemednecessary to show the entire cylinder.

l elaim- In a tluid speed-regulator device, the conihination of thecylinder T, pistou-rod A, and piston B, with a two-seated valve, Y, andsprings S, adapted to hold the valve open and to yield su t'tieieutl yto allow the valve to close when the velocity of the tluid in its valve-passage in either direction generates a certain amount of pressure.

\\"ILLIAl\[ E. NICKERSON.

Vitnesses:

FRANK G. PARKER, MATTHEW M. BLUNT.

